Why does html xmlns property affect errors

[MikeGale]

I checked at random, can't remember specifics.

Look at the br tags, some were closed with a /, that is an xhtml form.

I wouldn't worry about the details. With a good editor it takes less time to convert the bulk of the markup than it does to check it.

(I remember changing a code driven web site once. Over 500 pages, with systematically bad coding. That took regular expressions to fix, but in a few hours I did what would have taken weeks with hand editing.)